x = int(input())
if(x >= 30):
    print("Yes")
else:
    print("No") x = int(input()) x int(input()) int input() input if(x >= 30):
    print("Yes")
else:
    print("No") x >= 30 x 30 print("Yes") print "Yes" print("No") print "No" x = int(input()) int(input()) x
x = int(input())
if(x >= 30):
    print("Yes")
else:
    print("No")
